Ensure we are in a readable dir when running RabbitMQ scripts

If the current working directory is not readable, Erlang will crash.
This ensures that we run RabbitMQ scripts from a readable directory.

[#149425921]

Signed-off-by: Gerhard Lazu <gerhard@rabbitmq.com>

scripts/rabbitmq-script-wrapper

@@ -26,6 +26,7 @@ RABBITMQ_ENV=/usr/lib/rabbitmq/bin/rabbitmq-env
 RABBITMQ_SCRIPTS_DIR="$(dirname "$RABBITMQ_ENV")"
 
 main() {
+  ensure_we_are_in_a_readable_dir
   if current_user_is_rabbitmq
   then
     if calling_rabbitmq_server
@@ -42,6 +43,11 @@ main() {
   fi
 }
 
+ensure_we_are_in_a_readable_dir() {
+  # shellcheck disable=SC2164
+  cd ~rabbitmq || cd /
+}
+
 current_user_is_rabbitmq() {
   [ "$(id -un)" = "rabbitmq" ]
 }